The present invention provides a non-circular irregular excircle piston numerical control processing system and the control method thereof, and relates to the field of the numerical control processing technology. The non-circular irregular excircle piston numerical control processing system comprises a program module, a data module and a control execution module; the program module is configured to provide the program of control processing; the data module is configured to provide data corresponding to the program; and the control execution module is configured to match one group or several groups of programs and data at the same time. The control method comprises the following steps: a, selecting one group or several groups of programs and data according to the operation to be processed, the data corresponding to the program; and b, realizing a plurality of operations to execute at the same time after the programs and the data are matched and output at the same time. According to the invention, a plurality of processing technologies is integrated, the processing of a plurality of operations is completed through one-time clamping, so that the time of feeding and blanking is reduced, the advantages of high precision and high speed are maintained, and the efficiency and the precision of processing are greatly improved.